My kids were all relatively late talkers, so by the time they had the language to name colors, it was evident that they could distinguish and sort by color, and just needed labels for them. One of my HG+ sibs struggled with the names of colors well after learning to read (so probably K age). Used to name colors by the name of an object commonly associated with that color. "This the color of a..."

...pronounced like the long vowel and first letter of the alphabet...